1 /* 2 * Copyright (C) Sistina Software, Inc. 1997-2003 All rights reserved. 3 * Copyright (C) 2004-2007 Red Hat, Inc. All rights reserved. 4 * 5 * This copyrighted material is made available to anyone wishing to use, 6 * modify, copy, or redistribute it subject to the terms and conditions 7 * of the GNU General Public License version 2. 8 */ 9 10 /* 11 * Quota change tags are associated with each transaction that allocates or 12 * deallocates space. Those changes are accumulated locally to each node (in a 13 * per-node file) and then are periodically synced to the quota file. This 14 * avoids the bottleneck of constantly touching the quota file, but introduces 15 * fuzziness in the current usage value of IDs that are being used on different 16 * nodes in the cluster simultaneously. So, it is possible for a user on 17 * multiple nodes to overrun their quota, but that overrun is controlable. 18 * Since quota tags are part of transactions, there is no need for a quota check 19 * program to be run on node crashes or anything like that. 20 * 21 * There are couple of knobs that let the administrator manage the quota 22 * fuzziness. "quota_quantum" sets the maximum time a quota change can be 23 * sitting on one node before being synced to the quota file. (The default is 24 * 60 seconds.) Another knob, "quota_scale" controls how quickly the frequency 25 * of quota file syncs increases as the user moves closer to their limit. The 26 * more frequent the syncs, the more accurate the quota enforcement, but that 27 * means that there is more contention between the nodes for the quota file. 28 * The default value is one. This sets the maximum theoretical quota overrun 29 * (with infinite node with infinite bandwidth) to twice the user's limit. (In 30 * practice, the maximum overrun you see should be much less.) A "quota_scale" 31 * number greater than one makes quota syncs more frequent and reduces the 32 * maximum overrun. Numbers less than one (but greater than zero) make quota 33 * syncs less frequent. 34 * 35 * GFS quotas also use per-ID Lock Value Blocks (LVBs) to cache the contents of 36 * the quota file, so it is not being constantly read. 37 */ 38 39 #define pr_fmt(fmt) KBUILD_MODNAME ": " fmt 40 41 #include <linux/sched.h> 42 #include <linux/slab.h> 43 #include <linux/mm.h> 44 #include <linux/spinlock.h> 45 #include <linux/completion.h> 46 #include <linux/buffer_head.h> 47 #include <linux/sort.h> 48 #include <linux/fs.h> 49 #include <linux/bio.h> 50 #include <linux/gfs2_ondisk.h> 51 #include <linux/kthread.h> 52 #include <linux/freezer.h> 53 #include <linux/quota.h> 54 #include <linux/dqblk_xfs.h> 55 #include <linux/lockref.h> 56 #include <linux/list_lru.h> 57 #include <linux/rcupdate.h> 58 #include <linux/rculist_bl.h> 59 #include <linux/bit_spinlock.h> 60 #include <linux/jhash.h> 61 #include <linux/vmalloc.h> 62 63 #include "gfs2.h" 64 #include "incore.h" 65 #include "bmap.h" 66 #include "glock.h" 67 #include "glops.h" 68 #include "log.h" 69 #include "meta_io.h" 70 #include "quota.h" 71 #include "rgrp.h" 72 #include "super.h" 73 #include "trans.h" 74 #include "inode.h" 75 #include "util.h" 76 77 #define GFS2_QD_HASH_SHIFT 12 78 #define GFS2_QD_HASH_SIZE (1 << GFS2_QD_HASH_SHIFT) 79 #define GFS2_QD_HASH_MASK (GFS2_QD_HASH_SIZE - 1) 80 81 /* Lock order: qd_lock -> bucket lock -> qd->lockref.lock -> lru lock */ 82 /* -> sd_bitmap_lock */ 83 static DEFINE_SPINLOCK(qd_lock); 84 struct list_lru gfs2_qd_lru; 85 86 static struct hlist_bl_head qd_hash_table[GFS2_QD_HASH_SIZE]; 87 88 static unsigned int gfs2_qd_hash(const struct gfs2_sbd *sdp, 89 const struct kqid qid) 90 { 91 unsigned int h; 92 93 h = jhash(&sdp, sizeof(struct gfs2_sbd *), 0); 94 h = jhash(&qid, sizeof(struct kqid), h); 95 96 return h & GFS2_QD_HASH_MASK; 97 } 98 99 static inline void spin_lock_bucket(unsigned int hash) 100 { 101 hlist_bl_lock(&qd_hash_table[hash]); 102 } 103 104 static inline void spin_unlock_bucket(unsigned int hash) 105 { 106 hlist_bl_unlock(&qd_hash_table[hash]); 107 } 108 109 static void gfs2_qd_dealloc(struct rcu_head *rcu) 110 { 111 struct gfs2_quota_data *qd = container_of(rcu, struct gfs2_quota_data, qd_rcu); 112 kmem_cache_free(gfs2_quotad_cachep, qd); 113 } 114 115 static void gfs2_qd_dispose(struct list_head *list) 116 { 117 struct gfs2_quota_data *qd; 118 struct gfs2_sbd *sdp; 119 120 while (!list_empty(list)) { 121 qd = list_entry(list->next, struct gfs2_quota_data, qd_lru); 122 sdp = qd->qd_gl->gl_sbd; 123 124 list_del(&qd->qd_lru); 125 126 /* Free from the filesystem-specific list */ 127 spin_lock(&qd_lock); 128 list_del(&qd->qd_list); 129 spin_unlock(&qd_lock); 130 131 spin_lock_bucket(qd->qd_hash); 132 hlist_bl_del_rcu(&qd->qd_hlist); 133 spin_unlock_bucket(qd->qd_hash); 134 135 gfs2_assert_warn(sdp, !qd->qd_change); 136 gfs2_assert_warn(sdp, !qd->qd_slot_count); 137 gfs2_assert_warn(sdp, !qd->qd_bh_count); 138 139 gfs2_glock_put(qd->qd_gl); 140 atomic_dec(&sdp->sd_quota_count); 141 142 /* Delete it from the common reclaim list */ 143 call_rcu(&qd->qd_rcu, gfs2_qd_dealloc); 144 } 145 } 146 147 148 static enum lru_status gfs2_qd_isolate(struct list_head *item, spinlock_t *lock, void *arg) 149 { 150 struct list_head *dispose = arg; 151 struct gfs2_quota_data *qd = list_entry(item, struct gfs2_quota_data, qd_lru); 152 153 if (!spin_trylock(&qd->qd_lockref.lock)) 154 return LRU_SKIP; 155 156 if (qd->qd_lockref.count == 0) { 157 lockref_mark_dead(&qd->qd_lockref); 158 list_move(&qd->qd_lru, dispose); 159 } 160 161 spin_unlock(&qd->qd_lockref.lock); 162 return LRU_REMOVED; 163 } 164 165 static unsigned long gfs2_qd_shrink_scan(struct shrinker *shrink, 166 struct shrink_control *sc) 167 { 168 LIST_HEAD(dispose); 169 unsigned long freed; 170 171 if (!(sc->gfp_mask & __GFP_FS)) 172 return SHRINK_STOP; 173 174 freed = list_lru_walk_node(&gfs2_qd_lru, sc->nid, gfs2_qd_isolate, 175 &dispose, &sc->nr_to_scan); 176 177 gfs2_qd_dispose(&dispose); 178 179 return freed; 180 } 181 182 static unsigned long gfs2_qd_shrink_count(struct shrinker *shrink, 183 struct shrink_control *sc) 184 { 185 return vfs_pressure_ratio(list_lru_count_node(&gfs2_qd_lru, sc->nid)); 186 } 187 188 struct shrinker gfs2_qd_shrinker = { 189 .count_objects = gfs2_qd_shrink_count, 190 .scan_objects = gfs2_qd_shrink_scan, 191 .seeks = DEFAULT_SEEKS, 192 .flags = SHRINKER_NUMA_AWARE, 193 }; 194 195 196 static u64 qd2index(struct gfs2_quota_data *qd) 197 { 198 struct kqid qid = qd->qd_id; 199 return (2 * (u64)from_kqid(&init_user_ns, qid)) + 200 ((qid.type == USRQUOTA) ? 0 : 1); 201 } 202 203 static u64 qd2offset(struct gfs2_quota_data *qd) 204 { 205 u64 offset; 206 207 offset = qd2index(qd); 208 offset *= sizeof(struct gfs2_quota); 209 210 return offset; 211 } 212 213 static struct gfs2_quota_data *qd_alloc(unsigned hash, struct gfs2_sbd *sdp, struct kqid qid) 214 { 215 struct gfs2_quota_data *qd; 216 int error; 217 218 qd = kmem_cache_zalloc(gfs2_quotad_cachep, GFP_NOFS); 219 if (!qd) 220 return NULL; 221 222 qd->qd_sbd = sdp; 223 qd->qd_lockref.count = 1; 224 spin_lock_init(&qd->qd_lockref.lock); 225 qd->qd_id = qid; 226 qd->qd_slot = -1; 227 INIT_LIST_HEAD(&qd->qd_lru); 228 qd->qd_hash = hash; 229 230 error = gfs2_glock_get(sdp, qd2index(qd), 231 &gfs2_quota_glops, CREATE, &qd->qd_gl); 232 if (error) 233 goto fail; 234 235 return qd; 236 237 fail: 238 kmem_cache_free(gfs2_quotad_cachep, qd); 239 return NULL; 240 } 241 242 static struct gfs2_quota_data *gfs2_qd_search_bucket(unsigned int hash, 243 const struct gfs2_sbd *sdp, 244 struct kqid qid) 245 { 246 struct gfs2_quota_data *qd; 247 struct hlist_bl_node *h; 248 249 hlist_bl_for_each_entry_rcu(qd, h, &qd_hash_table[hash], qd_hlist) { 250 if (!qid_eq(qd->qd_id, qid)) 251 continue; 252 if (qd->qd_sbd != sdp) 253 continue; 254 if (lockref_get_not_dead(&qd->qd_lockref)) { 255 list_lru_del(&gfs2_qd_lru, &qd->qd_lru); 256 return qd; 257 } 258 } 259 260 return NULL; 261 } 262 263 264 static int qd_get(struct gfs2_sbd *sdp, struct kqid qid, 265 struct gfs2_quota_data **qdp) 266 { 267 struct gfs2_quota_data *qd, *new_qd; 268 unsigned int hash = gfs2_qd_hash(sdp, qid); 269 270 rcu_read_lock(); 271 *qdp = qd = gfs2_qd_search_bucket(hash, sdp, qid); 272 rcu_read_unlock(); 273 274 if (qd) 275 return 0; 276 277 new_qd = qd_alloc(hash, sdp, qid); 278 if (!new_qd) 279 return -ENOMEM; 280 281 spin_lock(&qd_lock); 282 spin_lock_bucket(hash); 283 *qdp = qd = gfs2_qd_search_bucket(hash, sdp, qid); 284 if (qd == NULL) { 285 *qdp = new_qd; 286 list_add(&new_qd->qd_list, &sdp->sd_quota_list); 287 hlist_bl_add_head_rcu(&new_qd->qd_hlist, &qd_hash_table[hash]); 288 atomic_inc(&sdp->sd_quota_count); 289 } 290 spin_unlock_bucket(hash); 291 spin_unlock(&qd_lock); 292 293 if (qd) { 294 gfs2_glock_put(new_qd->qd_gl); 295 kmem_cache_free(gfs2_quotad_cachep, new_qd); 296 } 297 298 return 0; 299 } 300 301 302 static void qd_hold(struct gfs2_quota_data *qd) 303 { 304 struct gfs2_sbd *sdp = qd->qd_gl->gl_sbd; 305 gfs2_assert(sdp, !__lockref_is_dead(&qd->qd_lockref)); 306 lockref_get(&qd->qd_lockref); 307 } 308 309 static void qd_put(struct gfs2_quota_data *qd) 310 { 311 if (lockref_put_or_lock(&qd->qd_lockref)) 312 return; 313 314 qd->qd_lockref.count = 0; 315 list_lru_add(&gfs2_qd_lru, &qd->qd_lru); 316 spin_unlock(&qd->qd_lockref.lock); 317 318 } 319 320 static int slot_get(struct gfs2_quota_data *qd) 321 { 322 struct gfs2_sbd *sdp = qd->qd_sbd; 323 unsigned int bit; 324 int error = 0; 325 326 spin_lock(&sdp->sd_bitmap_lock); 327 if (qd->qd_slot_count != 0) 328 goto out; 329 330 error = -ENOSPC; 331 bit = find_first_zero_bit(sdp->sd_quota_bitmap, sdp->sd_quota_slots); 332 if (bit < sdp->sd_quota_slots) { 333 set_bit(bit, sdp->sd_quota_bitmap); 334 qd->qd_slot = bit; 335 error = 0; 336 out: 337 qd->qd_slot_count++; 338 } 339 spin_unlock(&sdp->sd_bitmap_lock); 340 341 return error; 342 } 343 344 static void slot_hold(struct gfs2_quota_data *qd) 345 { 346 struct gfs2_sbd *sdp = qd->qd_sbd; 347 348 spin_lock(&sdp->sd_bitmap_lock); 349 gfs2_assert(sdp, qd->qd_slot_count); 350 qd->qd_slot_count++; 351 spin_unlock(&sdp->sd_bitmap_lock); 352 } 353 354 static void slot_put(struct gfs2_quota_data *qd) 355 { 356 struct gfs2_sbd *sdp = qd->qd_sbd; 357 358 spin_lock(&sdp->sd_bitmap_lock); 359 gfs2_assert(sdp, qd->qd_slot_count); 360 if (!--qd->qd_slot_count) { 361 BUG_ON(!test_and_clear_bit(qd->qd_slot, sdp->sd_quota_bitmap)); 362 qd->qd_slot = -1; 363 } 364 spin_unlock(&sdp->sd_bitmap_lock); 365 } 366 367 static int bh_get(struct gfs2_quota_data *qd) 368 { 369 struct gfs2_sbd *sdp = qd->qd_gl->gl_sbd; 370 struct gfs2_inode *ip = GFS2_I(sdp->sd_qc_inode); 371 unsigned int block, offset; 372 struct buffer_head *bh; 373 int error; 374 struct buffer_head bh_map = { .b_state = 0, .b_blocknr = 0 }; 375 376 mutex_lock(&sdp->sd_quota_mutex); 377 378 if (qd->qd_bh_count++) { 379 mutex_unlock(&sdp->sd_quota_mutex); 380 return 0; 381 } 382 383 block = qd->qd_slot / sdp->sd_qc_per_block; 384 offset = qd->qd_slot % sdp->sd_qc_per_block; 385 386 bh_map.b_size = 1 << ip->i_inode.i_blkbits; 387 error = gfs2_block_map(&ip->i_inode, block, &bh_map, 0); 388 if (error) 389 goto fail; 390 error = gfs2_meta_read(ip->i_gl, bh_map.b_blocknr, DIO_WAIT, &bh); 391 if (error) 392 goto fail; 393 error = -EIO; 394 if (gfs2_metatype_check(sdp, bh, GFS2_METATYPE_QC)) 395 goto fail_brelse; 396 397 qd->qd_bh = bh; 398 qd->qd_bh_qc = (struct gfs2_quota_change *) 399 (bh->b_data + sizeof(struct gfs2_meta_header) + 400 offset * sizeof(struct gfs2_quota_change)); 401 402 mutex_unlock(&sdp->sd_quota_mutex); 403 404 return 0; 405 406 fail_brelse: 407 brelse(bh); 408 fail: 409 qd->qd_bh_count--; 410 mutex_unlock(&sdp->sd_quota_mutex); 411 return error; 412 } 413 414 static void bh_put(struct gfs2_quota_data *qd) 415 { 416 struct gfs2_sbd *sdp = qd->qd_gl->gl_sbd; 417 418 mutex_lock(&sdp->sd_quota_mutex); 419 gfs2_assert(sdp, qd->qd_bh_count); 420 if (!--qd->qd_bh_count) { 421 brelse(qd->qd_bh); 422 qd->qd_bh = NULL; 423 qd->qd_bh_qc = NULL; 424 } 425 mutex_unlock(&sdp->sd_quota_mutex); 426 } 427 428 static int qd_check_sync(struct gfs2_sbd *sdp, struct gfs2_quota_data *qd, 429 u64 *sync_gen) 430 { 431 if (test_bit(QDF_LOCKED, &qd->qd_flags) || 432 !test_bit(QDF_CHANGE, &qd->qd_flags) || 433 (sync_gen && (qd->qd_sync_gen >= *sync_gen))) 434 return 0; 435 436 if (!lockref_get_not_dead(&qd->qd_lockref)) 437 return 0; 438 439 list_move_tail(&qd->qd_list, &sdp->sd_quota_list); 440 set_bit(QDF_LOCKED, &qd->qd_flags); 441 qd->qd_change_sync = qd->qd_change; 442 slot_hold(qd); 443 return 1; 444 } 445 446 static int qd_fish(struct gfs2_sbd *sdp, struct gfs2_quota_data **qdp) 447 { 448 struct gfs2_quota_data *qd = NULL; 449 int error; 450 int found = 0; 451 452 *qdp = NULL; 453 454 if (sdp->sd_vfs->s_flags & MS_RDONLY) 455 return 0; 456 457 spin_lock(&qd_lock); 458 459 list_for_each_entry(qd, &sdp->sd_quota_list, qd_list) { 460 found = qd_check_sync(sdp, qd, &sdp->sd_quota_sync_gen); 461 if (found) 462 break; 463 } 464 465 if (!found) 466 qd = NULL; 467 468 spin_unlock(&qd_lock); 469 470 if (qd) { 471 gfs2_assert_warn(sdp, qd->qd_change_sync); 472 error = bh_get(qd); 473 if (error) { 474 clear_bit(QDF_LOCKED, &qd->qd_flags); 475 slot_put(qd); 476 qd_put(qd); 477 return error; 478 } 479 } 480 481 *qdp = qd; 482 483 return 0; 484 } 485 486 static void qd_unlock(struct gfs2_quota_data *qd) 487 { 488 gfs2_assert_warn(qd->qd_gl->gl_sbd, 489 test_bit(QDF_LOCKED, &qd->qd_flags)); 490 clear_bit(QDF_LOCKED, &qd->qd_flags); 491 bh_put(qd); 492 slot_put(qd); 493 qd_put(qd); 494 } 495 496 static int qdsb_get(struct gfs2_sbd *sdp, struct kqid qid, 497 struct gfs2_quota_data **qdp) 498 { 499 int error; 500 501 error = qd_get(sdp, qid, qdp); 502 if (error) 503 return error; 504 505 error = slot_get(*qdp); 506 if (error) 507 goto fail; 508 509 error = bh_get(*qdp); 510 if (error) 511 goto fail_slot; 512 513 return 0; 514 515 fail_slot: 516 slot_put(*qdp); 517 fail: 518 qd_put(*qdp); 519 return error; 520 } 521 522 static void qdsb_put(struct gfs2_quota_data *qd) 523 { 524 bh_put(qd); 525 slot_put(qd); 526 qd_put(qd); 527 } 528 529 int gfs2_quota_hold(struct gfs2_inode *ip, kuid_t uid, kgid_t gid) 530 { 531 struct gfs2_sbd *sdp = GFS2_SB(&ip->i_inode); 532 struct gfs2_quota_data **qd; 533 int error; 534 535 if (ip->i_res == NULL) { 536 error = gfs2_rs_alloc(ip); 537 if (error) 538 return error; 539 } 540 541 qd = ip->i_res->rs_qa_qd; 542 543 if (gfs2_assert_warn(sdp, !ip->i_res->rs_qa_qd_num) || 544 gfs2_assert_warn(sdp, !test_bit(GIF_QD_LOCKED, &ip->i_flags))) 545 return -EIO; 546 547 if (sdp->sd_args.ar_quota == GFS2_QUOTA_OFF) 548 return 0; 549 550 error = qdsb_get(sdp, make_kqid_uid(ip->i_inode.i_uid), qd); 551 if (error) 552 goto out; 553 ip->i_res->rs_qa_qd_num++; 554 qd++; 555 556 error = qdsb_get(sdp, make_kqid_gid(ip->i_inode.i_gid), qd); 557 if (error) 558 goto out; 559 ip->i_res->rs_qa_qd_num++; 560 qd++; 561 562 if (!uid_eq(uid, NO_UID_QUOTA_CHANGE) && 563 !uid_eq(uid, ip->i_inode.i_uid)) { 564 error = qdsb_get(sdp, make_kqid_uid(uid), qd); 565 if (error) 566 goto out; 567 ip->i_res->rs_qa_qd_num++; 568 qd++; 569 } 570 571 if (!gid_eq(gid, NO_GID_QUOTA_CHANGE) && 572 !gid_eq(gid, ip->i_inode.i_gid)) { 573 error = qdsb_get(sdp, make_kqid_gid(gid), qd); 574 if (error) 575 goto out; 576 ip->i_res->rs_qa_qd_num++; 577 qd++; 578 } 579 580 out: 581 if (error) 582 gfs2_quota_unhold(ip); 583 return error; 584 } 585 586 void gfs2_quota_unhold(struct gfs2_inode *ip) 587 { 588 struct gfs2_sbd *sdp = GFS2_SB(&ip->i_inode); 589 unsigned int x; 590 591 if (ip->i_res == NULL) 592 return; 593 gfs2_assert_warn(sdp, !test_bit(GIF_QD_LOCKED, &ip->i_flags)); 594 595 for (x = 0; x < ip->i_res->rs_qa_qd_num; x++) { 596 qdsb_put(ip->i_res->rs_qa_qd[x]); 597 ip->i_res->rs_qa_qd[x] = NULL; 598 } 599 ip->i_res->rs_qa_qd_num = 0; 600 } 601 602 static int sort_qd(const void *a, const void *b) 603 { 604 const struct gfs2_quota_data *qd_a = *(const struct gfs2_quota_data **)a; 605 const struct gfs2_quota_data *qd_b = *(const struct gfs2_quota_data **)b; 606 607 if (qid_lt(qd_a->qd_id, qd_b->qd_id)) 608 return -1; 609 if (qid_lt(qd_b->qd_id, qd_a->qd_id)) 610 return 1; 611 return 0; 612 } 613 614 static void do_qc(struct gfs2_quota_data *qd, s64 change) 615 { 616 struct gfs2_sbd *sdp = qd->qd_gl->gl_sbd; 617 struct gfs2_inode *ip = GFS2_I(sdp->sd_qc_inode); 618 struct gfs2_quota_change *qc = qd->qd_bh_qc; 619 s64 x; 620 621 mutex_lock(&sdp->sd_quota_mutex); 622 gfs2_trans_add_meta(ip->i_gl, qd->qd_bh); 623 624 if (!test_bit(QDF_CHANGE, &qd->qd_flags)) { 625 qc->qc_change = 0; 626 qc->qc_flags = 0; 627 if (qd->qd_id.type == USRQUOTA) 628 qc->qc_flags = cpu_to_be32(GFS2_QCF_USER); 629 qc->qc_id = cpu_to_be32(from_kqid(&init_user_ns, qd->qd_id)); 630 } 631 632 x = be64_to_cpu(qc->qc_change) + change; 633 qc->qc_change = cpu_to_be64(x); 634 635 spin_lock(&qd_lock); 636 qd->qd_change = x; 637 spin_unlock(&qd_lock); 638 639 if (!x) { 640 gfs2_assert_warn(sdp, test_bit(QDF_CHANGE, &qd->qd_flags)); 641 clear_bit(QDF_CHANGE, &qd->qd_flags); 642 qc->qc_flags = 0; 643 qc->qc_id = 0; 644 slot_put(qd); 645 qd_put(qd); 646 } else if (!test_and_set_bit(QDF_CHANGE, &qd->qd_flags)) { 647 qd_hold(qd); 648 slot_hold(qd); 649 } 650 651 mutex_unlock(&sdp->sd_quota_mutex); 652 } 653 654 /** 655 * gfs2_adjust_quota - adjust record of current block usage 656 * @ip: The quota inode 657 * @loc: Offset of the entry in the quota file 658 * @change: The amount of usage change to record 659 * @qd: The quota data 660 * @fdq: The updated limits to record 661 * 662 * This function was mostly borrowed from gfs2_block_truncate_page which was 663 * in turn mostly borrowed from ext3 664 * 665 * Returns: 0 or -ve on error 666 */ 667 668 static int gfs2_adjust_quota(struct gfs2_inode *ip, loff_t loc, 669 s64 change, struct gfs2_quota_data *qd, 670 struct fs_disk_quota *fdq) 671 { 672 struct inode *inode = &ip->i_inode; 673 struct gfs2_sbd *sdp = GFS2_SB(inode); 674 struct address_space *mapping = inode->i_mapping; 675 unsigned long index = loc >> PAGE_CACHE_SHIFT; 676 unsigned offset = loc & (PAGE_CACHE_SIZE - 1); 677 unsigned blocksize, iblock, pos; 678 struct buffer_head *bh; 679 struct page *page; 680 void *kaddr, *ptr; 681 struct gfs2_quota q; 682 int err, nbytes; 683 u64 size; 684 685 if (gfs2_is_stuffed(ip)) { 686 err = gfs2_unstuff_dinode(ip, NULL); 687 if (err) 688 return err; 689 } 690 691 memset(&q, 0, sizeof(struct gfs2_quota)); 692 err = gfs2_internal_read(ip, (char *)&q, &loc, sizeof(q)); 693 if (err < 0) 694 return err; 695 696 err = -EIO; 697 be64_add_cpu(&q.qu_value, change); 698 qd->qd_qb.qb_value = q.qu_value; 699 if (fdq) { 700 if (fdq->d_fieldmask & FS_DQ_BSOFT) { 701 q.qu_warn = cpu_to_be64(fdq->d_blk_softlimit >> sdp->sd_fsb2bb_shift); 702 qd->qd_qb.qb_warn = q.qu_warn; 703 } 704 if (fdq->d_fieldmask & FS_DQ_BHARD) { 705 q.qu_limit = cpu_to_be64(fdq->d_blk_hardlimit >> sdp->sd_fsb2bb_shift); 706 qd->qd_qb.qb_limit = q.qu_limit; 707 } 708 if (fdq->d_fieldmask & FS_DQ_BCOUNT) { 709 q.qu_value = cpu_to_be64(fdq->d_bcount >> sdp->sd_fsb2bb_shift); 710 qd->qd_qb.qb_value = q.qu_value; 711 } 712 } 713 714 /* Write the quota into the quota file on disk */ 715 ptr = &q; 716 nbytes = sizeof(struct gfs2_quota); 717 get_a_page: 718 page = find_or_create_page(mapping, index, GFP_NOFS); 719 if (!page) 720 return -ENOMEM; 721 722 blocksize = inode->i_sb->s_blocksize; 723 iblock = index << (PAGE_CACHE_SHIFT - inode->i_sb->s_blocksize_bits); 724 725 if (!page_has_buffers(page)) 726 create_empty_buffers(page, blocksize, 0); 727 728 bh = page_buffers(page); 729 pos = blocksize; 730 while (offset >= pos) { 731 bh = bh->b_this_page; 732 iblock++; 733 pos += blocksize; 734 } 735 736 if (!buffer_mapped(bh)) { 737 gfs2_block_map(inode, iblock, bh, 1); 738 if (!buffer_mapped(bh)) 739 goto unlock_out; 740 /* If it's a newly allocated disk block for quota, zero it */ 741 if (buffer_new(bh)) 742 zero_user(page, pos - blocksize, bh->b_size); 743 } 744 745 if (PageUptodate(page)) 746 set_buffer_uptodate(bh); 747 748 if (!buffer_uptodate(bh)) { 749 ll_rw_block(READ | REQ_META, 1, &bh); 750 wait_on_buffer(bh); 751 if (!buffer_uptodate(bh)) 752 goto unlock_out; 753 } 754 755 gfs2_trans_add_data(ip->i_gl, bh); 756 757 kaddr = kmap_atomic(page); 758 if (offset + sizeof(struct gfs2_quota) > PAGE_CACHE_SIZE) 759 nbytes = PAGE_CACHE_SIZE - offset; 760 memcpy(kaddr + offset, ptr, nbytes); 761 flush_dcache_page(page); 762 kunmap_atomic(kaddr); 763 unlock_page(page); 764 page_cache_release(page); 765 766 /* If quota straddles page boundary, we need to update the rest of the 767 * quota at the beginning of the next page */ 768 if ((offset + sizeof(struct gfs2_quota)) > PAGE_CACHE_SIZE) { 769 ptr = ptr + nbytes; 770 nbytes = sizeof(struct gfs2_quota) - nbytes; 771 offset = 0; 772 index++; 773 goto get_a_page; 774 } 775 776 size = loc + sizeof(struct gfs2_quota); 777 if (size > inode->i_size) 778 i_size_write(inode, size); 779 inode->i_mtime = inode->i_atime = CURRENT_TIME; 780 mark_inode_dirty(inode); 781 set_bit(QDF_REFRESH, &qd->qd_flags); 782 return 0; 783 784 unlock_out: 785 unlock_page(page); 786 page_cache_release(page); 787 return err; 788 } 789 790 static int do_sync(unsigned int num_qd, struct gfs2_quota_data **qda) 791 { 792 struct gfs2_sbd *sdp = (*qda)->qd_gl->gl_sbd; 793 struct gfs2_inode *ip = GFS2_I(sdp->sd_quota_inode); 794 struct gfs2_alloc_parms ap = { .aflags = 0, }; 795 unsigned int data_blocks, ind_blocks; 796 struct gfs2_holder *ghs, i_gh; 797 unsigned int qx, x; 798 struct gfs2_quota_data *qd; 799 unsigned reserved; 800 loff_t offset; 801 unsigned int nalloc = 0, blocks; 802 int error; 803 804 error = gfs2_rs_alloc(ip); 805 if (error) 806 return error; 807 808 gfs2_write_calc_reserv(ip, sizeof(struct gfs2_quota), 809 &data_blocks, &ind_blocks); 810 811 ghs = kcalloc(num_qd, sizeof(struct gfs2_holder), GFP_NOFS); 812 if (!ghs) 813 return -ENOMEM; 814 815 sort(qda, num_qd, sizeof(struct gfs2_quota_data *), sort_qd, NULL); 816 mutex_lock(&ip->i_inode.i_mutex); 817 for (qx = 0; qx < num_qd; qx++) { 818 error = gfs2_glock_nq_init(qda[qx]->qd_gl, LM_ST_EXCLUSIVE, 819 GL_NOCACHE, &ghs[qx]); 820 if (error) 821 goto out; 822 } 823 824 error = gfs2_glock_nq_init(ip->i_gl, LM_ST_EXCLUSIVE, 0, &i_gh); 825 if (error) 826 goto out; 827 828 for (x = 0; x < num_qd; x++) { 829 offset = qd2offset(qda[x]); 830 if (gfs2_write_alloc_required(ip, offset, 831 sizeof(struct gfs2_quota))) 832 nalloc++; 833 } 834 835 /* 836 * 1 blk for unstuffing inode if stuffed. We add this extra 837 * block to the reservation unconditionally. If the inode 838 * doesn't need unstuffing, the block will be released to the 839 * rgrp since it won't be allocated during the transaction 840 */ 841 /* +3 in the end for unstuffing block, inode size update block 842 * and another block in case quota straddles page boundary and 843 * two blocks need to be updated instead of 1 */ 844 blocks = num_qd * data_blocks + RES_DINODE + num_qd + 3; 845 846 reserved = 1 + (nalloc * (data_blocks + ind_blocks)); 847 ap.target = reserved; 848 error = gfs2_inplace_reserve(ip, &ap); 849 if (error) 850 goto out_alloc; 851 852 if (nalloc) 853 blocks += gfs2_rg_blocks(ip, reserved) + nalloc * ind_blocks + RES_STATFS; 854 855 error = gfs2_trans_begin(sdp, blocks, 0); 856 if (error) 857 goto out_ipres; 858 859 for (x = 0; x < num_qd; x++) { 860 qd = qda[x]; 861 offset = qd2offset(qd); 862 error = gfs2_adjust_quota(ip, offset, qd->qd_change_sync, qd, NULL); 863 if (error) 864 goto out_end_trans; 865 866 do_qc(qd, -qd->qd_change_sync); 867 set_bit(QDF_REFRESH, &qd->qd_flags); 868 } 869 870 error = 0; 871 872 out_end_trans: 873 gfs2_trans_end(sdp); 874 out_ipres: 875 gfs2_inplace_release(ip); 876 out_alloc: 877 gfs2_glock_dq_uninit(&i_gh); 878 out: 879 while (qx--) 880 gfs2_glock_dq_uninit(&ghs[qx]); 881 mutex_unlock(&ip->i_inode.i_mutex); 882 kfree(ghs); 883 gfs2_log_flush(ip->i_gl->gl_sbd, ip->i_gl, NORMAL_FLUSH); 884 return error; 885 } 886 887 static int update_qd(struct gfs2_sbd *sdp, struct gfs2_quota_data *qd) 888 { 889 struct gfs2_inode *ip = GFS2_I(sdp->sd_quota_inode); 890 struct gfs2_quota q; 891 struct gfs2_quota_lvb *qlvb; 892 loff_t pos; 893 int error; 894 895 memset(&q, 0, sizeof(struct gfs2_quota)); 896 pos = qd2offset(qd); 897 error = gfs2_internal_read(ip, (char *)&q, &pos, sizeof(q)); 898 if (error < 0) 899 return error; 900 901 qlvb = (struct gfs2_quota_lvb *)qd->qd_gl->gl_lksb.sb_lvbptr; 902 qlvb->qb_magic = cpu_to_be32(GFS2_MAGIC); 903 qlvb->__pad = 0; 904 qlvb->qb_limit = q.qu_limit; 905 qlvb->qb_warn = q.qu_warn; 906 qlvb->qb_value = q.qu_value; 907 qd->qd_qb = *qlvb; 908 909 return 0; 910 } 911 912 static int do_glock(struct gfs2_quota_data *qd, int force_refresh, 913 struct gfs2_holder *q_gh) 914 { 915 struct gfs2_sbd *sdp = qd->qd_gl->gl_sbd; 916 struct gfs2_inode *ip = GFS2_I(sdp->sd_quota_inode); 917 struct gfs2_holder i_gh; 918 int error; 919 920 restart: 921 error = gfs2_glock_nq_init(qd->qd_gl, LM_ST_SHARED, 0, q_gh); 922 if (error) 923 return error; 924 925 qd->qd_qb = *(struct gfs2_quota_lvb *)qd->qd_gl->gl_lksb.sb_lvbptr; 926 927 if (force_refresh || qd->qd_qb.qb_magic != cpu_to_be32(GFS2_MAGIC)) { 928 gfs2_glock_dq_uninit(q_gh); 929 error = gfs2_glock_nq_init(qd->qd_gl, LM_ST_EXCLUSIVE, 930 GL_NOCACHE, q_gh); 931 if (error) 932 return error; 933 934 error = gfs2_glock_nq_init(ip->i_gl, LM_ST_SHARED, 0, &i_gh); 935 if (error) 936 goto fail; 937 938 error = update_qd(sdp, qd); 939 if (error) 940 goto fail_gunlock; 941 942 gfs2_glock_dq_uninit(&i_gh); 943 gfs2_glock_dq_uninit(q_gh); 944 force_refresh = 0; 945 goto restart; 946 } 947 948 return 0; 949 950 fail_gunlock: 951 gfs2_glock_dq_uninit(&i_gh); 952 fail: 953 gfs2_glock_dq_uninit(q_gh); 954 return error; 955 } 956 957 int gfs2_quota_lock(struct gfs2_inode *ip, kuid_t uid, kgid_t gid) 958 { 959 struct gfs2_sbd *sdp = GFS2_SB(&ip->i_inode); 960 struct gfs2_quota_data *qd; 961 unsigned int x; 962 int error = 0; 963 964 error = gfs2_quota_hold(ip, uid, gid); 965 if (error) 966 return error; 967 968 if (capable(CAP_SYS_RESOURCE) || 969 sdp->sd_args.ar_quota != GFS2_QUOTA_ON) 970 return 0; 971 972 sort(ip->i_res->rs_qa_qd, ip->i_res->rs_qa_qd_num, 973 sizeof(struct gfs2_quota_data *), sort_qd, NULL); 974 975 for (x = 0; x < ip->i_res->rs_qa_qd_num; x++) { 976 int force = NO_FORCE; 977 qd = ip->i_res->rs_qa_qd[x]; 978 if (test_and_clear_bit(QDF_REFRESH, &qd->qd_flags)) 979 force = FORCE; 980 error = do_glock(qd, force, &ip->i_res->rs_qa_qd_ghs[x]); 981 if (error) 982 break; 983 } 984 985 if (!error) 986 set_bit(GIF_QD_LOCKED, &ip->i_flags); 987 else { 988 while (x--) 989 gfs2_glock_dq_uninit(&ip->i_res->rs_qa_qd_ghs[x]); 990 gfs2_quota_unhold(ip); 991 } 992 993 return error; 994 } 995 996 static int need_sync(struct gfs2_quota_data *qd) 997 { 998 struct gfs2_sbd *sdp = qd->qd_gl->gl_sbd; 999 struct gfs2_tune *gt = &sdp->sd_tune; 1000 s64 value; 1001 unsigned int num, den; 1002 int do_sync = 1; 1003 1004 if (!qd->qd_qb.qb_limit) 1005 return 0; 1006 1007 spin_lock(&qd_lock); 1008 value = qd->qd_change; 1009 spin_unlock(&qd_lock); 1010 1011 spin_lock(>->gt_spin); 1012 num = gt->gt_quota_scale_num; 1013 den = gt->gt_quota_scale_den; 1014 spin_unlock(>->gt_spin); 1015 1016 if (value < 0) 1017 do_sync = 0; 1018 else if ((s64)be64_to_cpu(qd->qd_qb.qb_value) >= 1019 (s64)be64_to_cpu(qd->qd_qb.qb_limit)) 1020 do_sync = 0; 1021 else { 1022 value *= gfs2_jindex_size(sdp) * num; 1023 value = div_s64(value, den); 1024 value += (s64)be64_to_cpu(qd->qd_qb.qb_value); 1025 if (value < (s64)be64_to_cpu(qd->qd_qb.qb_limit)) 1026 do_sync = 0; 1027 } 1028 1029 return do_sync; 1030 } 1031 1032 void gfs2_quota_unlock(struct gfs2_inode *ip) 1033 { 1034 struct gfs2_sbd *sdp = GFS2_SB(&ip->i_inode); 1035 struct gfs2_quota_data *qda[4]; 1036 unsigned int count = 0; 1037 unsigned int x; 1038 int found; 1039 1040 if (!test_and_clear_bit(GIF_QD_LOCKED, &ip->i_flags)) 1041 goto out; 1042 1043 for (x = 0; x < ip->i_res->rs_qa_qd_num; x++) { 1044 struct gfs2_quota_data *qd; 1045 int sync; 1046 1047 qd = ip->i_res->rs_qa_qd[x]; 1048 sync = need_sync(qd); 1049 1050 gfs2_glock_dq_uninit(&ip->i_res->rs_qa_qd_ghs[x]); 1051 if (!sync) 1052 continue; 1053 1054 spin_lock(&qd_lock); 1055 found = qd_check_sync(sdp, qd, NULL); 1056 spin_unlock(&qd_lock); 1057 1058 if (!found) 1059 continue; 1060 1061 gfs2_assert_warn(sdp, qd->qd_change_sync); 1062 if (bh_get(qd)) { 1063 clear_bit(QDF_LOCKED, &qd->qd_flags); 1064 slot_put(qd); 1065 qd_put(qd); 1066 continue; 1067 } 1068 1069 qda[count++] = qd; 1070 } 1071 1072 if (count) { 1073 do_sync(count, qda); 1074 for (x = 0; x < count; x++) 1075 qd_unlock(qda[x]); 1076 } 1077 1078 out: 1079 gfs2_quota_unhold(ip); 1080 } 1081 1082 #define MAX_LINE 256 1083 1084 static int print_message(struct gfs2_quota_data *qd, char *type) 1085 { 1086 struct gfs2_sbd *sdp = qd->qd_gl->gl_sbd; 1087 1088 fs_info(sdp, "quota %s for %s %u\n", 1089 type, 1090 (qd->qd_id.type == USRQUOTA) ? "user" : "group", 1091 from_kqid(&init_user_ns, qd->qd_id)); 1092 1093 return 0; 1094 } 1095 1096 int gfs2_quota_check(struct gfs2_inode *ip, kuid_t uid, kgid_t gid) 1097 { 1098 struct gfs2_sbd *sdp = GFS2_SB(&ip->i_inode); 1099 struct gfs2_quota_data *qd; 1100 s64 value; 1101 unsigned int x; 1102 int error = 0; 1103 1104 if (!test_bit(GIF_QD_LOCKED, &ip->i_flags)) 1105 return 0; 1106 1107 if (sdp->sd_args.ar_quota != GFS2_QUOTA_ON) 1108 return 0; 1109 1110 for (x = 0; x < ip->i_res->rs_qa_qd_num; x++) { 1111 qd = ip->i_res->rs_qa_qd[x]; 1112 1113 if (!(qid_eq(qd->qd_id, make_kqid_uid(uid)) || 1114 qid_eq(qd->qd_id, make_kqid_gid(gid)))) 1115 continue; 1116 1117 value = (s64)be64_to_cpu(qd->qd_qb.qb_value); 1118 spin_lock(&qd_lock); 1119 value += qd->qd_change; 1120 spin_unlock(&qd_lock); 1121 1122 if (be64_to_cpu(qd->qd_qb.qb_limit) && (s64)be64_to_cpu(qd->qd_qb.qb_limit) < value) { 1123 print_message(qd, "exceeded"); 1124 quota_send_warning(qd->qd_id, 1125 sdp->sd_vfs->s_dev, QUOTA_NL_BHARDWARN); 1126 1127 error = -EDQUOT; 1128 break; 1129 } else if (be64_to_cpu(qd->qd_qb.qb_warn) && 1130 (s64)be64_to_cpu(qd->qd_qb.qb_warn) < value && 1131 time_after_eq(jiffies, qd->qd_last_warn + 1132 gfs2_tune_get(sdp, 1133 gt_quota_warn_period) * HZ)) { 1134 quota_send_warning(qd->qd_id, 1135 sdp->sd_vfs->s_dev, QUOTA_NL_BSOFTWARN); 1136 error = print_message(qd, "warning"); 1137 qd->qd_last_warn = jiffies; 1138 } 1139 } 1140 1141 return error; 1142 } 1143 1144 void gfs2_quota_change(struct gfs2_inode *ip, s64 change, 1145 kuid_t uid, kgid_t gid) 1146 { 1147 struct gfs2_quota_data *qd; 1148 unsigned int x; 1149 1150 if (gfs2_assert_warn(GFS2_SB(&ip->i_inode), change)) 1151 return; 1152 if (ip->i_diskflags & GFS2_DIF_SYSTEM) 1153 return; 1154 1155 for (x = 0; x < ip->i_res->rs_qa_qd_num; x++) { 1156 qd = ip->i_res->rs_qa_qd[x]; 1157 1158 if (qid_eq(qd->qd_id, make_kqid_uid(uid)) || 1159 qid_eq(qd->qd_id, make_kqid_gid(gid))) { 1160 do_qc(qd, change); 1161 } 1162 } 1163 } 1164 1165 int gfs2_quota_sync(struct super_block *sb, int type) 1166 { 1167 struct gfs2_sbd *sdp = sb->s_fs_info; 1168 struct gfs2_quota_data **qda; 1169 unsigned int max_qd = PAGE_SIZE/sizeof(struct gfs2_holder); 1170 unsigned int num_qd; 1171 unsigned int x; 1172 int error = 0; 1173 1174 qda = kcalloc(max_qd, sizeof(struct gfs2_quota_data *), GFP_KERNEL); 1175 if (!qda) 1176 return -ENOMEM; 1177 1178 mutex_lock(&sdp->sd_quota_sync_mutex); 1179 sdp->sd_quota_sync_gen++; 1180 1181 do { 1182 num_qd = 0; 1183 1184 for (;;) { 1185 error = qd_fish(sdp, qda + num_qd); 1186 if (error || !qda[num_qd]) 1187 break; 1188 if (++num_qd == max_qd) 1189 break; 1190 } 1191 1192 if (num_qd) { 1193 if (!error) 1194 error = do_sync(num_qd, qda); 1195 if (!error) 1196 for (x = 0; x < num_qd; x++) 1197 qda[x]->qd_sync_gen = 1198 sdp->sd_quota_sync_gen; 1199 1200 for (x = 0; x < num_qd; x++) 1201 qd_unlock(qda[x]); 1202 } 1203 } while (!error && num_qd == max_qd); 1204 1205 mutex_unlock(&sdp->sd_quota_sync_mutex); 1206 kfree(qda); 1207 1208 return error; 1209 } 1210 1211 int gfs2_quota_refresh(struct gfs2_sbd *sdp, struct kqid qid) 1212 { 1213 struct gfs2_quota_data *qd; 1214 struct gfs2_holder q_gh; 1215 int error; 1216 1217 error = qd_get(sdp, qid, &qd); 1218 if (error) 1219 return error; 1220 1221 error = do_glock(qd, FORCE, &q_gh); 1222 if (!error) 1223 gfs2_glock_dq_uninit(&q_gh); 1224 1225 qd_put(qd); 1226 return error; 1227 } 1228 1229 int gfs2_quota_init(struct gfs2_sbd *sdp) 1230 { 1231 struct gfs2_inode *ip = GFS2_I(sdp->sd_qc_inode); 1232 u64 size = i_size_read(sdp->sd_qc_inode); 1233 unsigned int blocks = size >> sdp->sd_sb.sb_bsize_shift; 1234 unsigned int x, slot = 0; 1235 unsigned int found = 0; 1236 unsigned int hash; 1237 unsigned int bm_size; 1238 u64 dblock; 1239 u32 extlen = 0; 1240 int error; 1241 1242 if (gfs2_check_internal_file_size(sdp->sd_qc_inode, 1, 64 << 20)) 1243 return -EIO; 1244 1245 sdp->sd_quota_slots = blocks * sdp->sd_qc_per_block; 1246 bm_size = DIV_ROUND_UP(sdp->sd_quota_slots, 8 * sizeof(unsigned long)); 1247 bm_size *= sizeof(unsigned long); 1248 error = -ENOMEM; 1249 sdp->sd_quota_bitmap = kzalloc(bm_size, GFP_NOFS | __GFP_NOWARN); 1250 if (sdp->sd_quota_bitmap == NULL) 1251 sdp->sd_quota_bitmap = __vmalloc(bm_size, GFP_NOFS | 1252 __GFP_ZERO, PAGE_KERNEL); 1253 if (!sdp->sd_quota_bitmap) 1254 return error; 1255 1256 for (x = 0; x < blocks; x++) { 1257 struct buffer_head *bh; 1258 const struct gfs2_quota_change *qc; 1259 unsigned int y; 1260 1261 if (!extlen) { 1262 int new = 0; 1263 error = gfs2_extent_map(&ip->i_inode, x, &new, &dblock, &extlen); 1264 if (error) 1265 goto fail; 1266 } 1267 error = -EIO; 1268 bh = gfs2_meta_ra(ip->i_gl, dblock, extlen); 1269 if (!bh) 1270 goto fail; 1271 if (gfs2_metatype_check(sdp, bh, GFS2_METATYPE_QC)) { 1272 brelse(bh); 1273 goto fail; 1274 } 1275 1276 qc = (const struct gfs2_quota_change *)(bh->b_data + sizeof(struct gfs2_meta_header)); 1277 for (y = 0; y < sdp->sd_qc_per_block && slot < sdp->sd_quota_slots; 1278 y++, slot++) { 1279 struct gfs2_quota_data *qd; 1280 s64 qc_change = be64_to_cpu(qc->qc_change); 1281 u32 qc_flags = be32_to_cpu(qc->qc_flags); 1282 enum quota_type qtype = (qc_flags & GFS2_QCF_USER) ? 1283 USRQUOTA : GRPQUOTA; 1284 struct kqid qc_id = make_kqid(&init_user_ns, qtype, 1285 be32_to_cpu(qc->qc_id)); 1286 qc++; 1287 if (!qc_change) 1288 continue; 1289 1290 hash = gfs2_qd_hash(sdp, qc_id); 1291 qd = qd_alloc(hash, sdp, qc_id); 1292 if (qd == NULL) { 1293 brelse(bh); 1294 goto fail; 1295 } 1296 1297 set_bit(QDF_CHANGE, &qd->qd_flags); 1298 qd->qd_change = qc_change; 1299 qd->qd_slot = slot; 1300 qd->qd_slot_count = 1; 1301 1302 spin_lock(&qd_lock); 1303 BUG_ON(test_and_set_bit(slot, sdp->sd_quota_bitmap)); 1304 list_add(&qd->qd_list, &sdp->sd_quota_list); 1305 atomic_inc(&sdp->sd_quota_count); 1306 spin_unlock(&qd_lock); 1307 1308 spin_lock_bucket(hash); 1309 hlist_bl_add_head_rcu(&qd->qd_hlist, &qd_hash_table[hash]); 1310 spin_unlock_bucket(hash); 1311 1312 found++; 1313 } 1314 1315 brelse(bh); 1316 dblock++; 1317 extlen--; 1318 } 1319 1320 if (found) 1321 fs_info(sdp, "found %u quota changes\n", found); 1322 1323 return 0; 1324 1325 fail: 1326 gfs2_quota_cleanup(sdp); 1327 return error; 1328 } 1329 1330 void gfs2_quota_cleanup(struct gfs2_sbd *sdp) 1331 { 1332 struct list_head *head = &sdp->sd_quota_list; 1333 struct gfs2_quota_data *qd; 1334 1335 spin_lock(&qd_lock); 1336 while (!list_empty(head)) { 1337 qd = list_entry(head->prev, struct gfs2_quota_data, qd_list); 1338 1339 list_del(&qd->qd_list); 1340 1341 /* Also remove if this qd exists in the reclaim list */ 1342 list_lru_del(&gfs2_qd_lru, &qd->qd_lru); 1343 atomic_dec(&sdp->sd_quota_count); 1344 spin_unlock(&qd_lock); 1345 1346 spin_lock_bucket(qd->qd_hash); 1347 hlist_bl_del_rcu(&qd->qd_hlist); 1348 spin_unlock_bucket(qd->qd_hash); 1349 1350 gfs2_assert_warn(sdp, !qd->qd_change); 1351 gfs2_assert_warn(sdp, !qd->qd_slot_count); 1352 gfs2_assert_warn(sdp, !qd->qd_bh_count); 1353 1354 gfs2_glock_put(qd->qd_gl); 1355 call_rcu(&qd->qd_rcu, gfs2_qd_dealloc); 1356 1357 spin_lock(&qd_lock); 1358 } 1359 spin_unlock(&qd_lock); 1360 1361 gfs2_assert_warn(sdp, !atomic_read(&sdp->sd_quota_count)); 1362 1363 kvfree(sdp->sd_quota_bitmap); 1364 sdp->sd_quota_bitmap = NULL; 1365 } 1366 1367 static void quotad_error(struct gfs2_sbd *sdp, const char *msg, int error) 1368 { 1369 if (error == 0 || error == -EROFS) 1370 return; 1371 if (!test_bit(SDF_SHUTDOWN, &sdp->sd_flags)) 1372 fs_err(sdp, "gfs2_quotad: %s error %d\n", msg, error); 1373 } 1374 1375 static void quotad_check_timeo(struct gfs2_sbd *sdp, const char *msg, 1376 int (*fxn)(struct super_block *sb, int type), 1377 unsigned long t, unsigned long *timeo, 1378 unsigned int *new_timeo) 1379 { 1380 if (t >= *timeo) { 1381 int error = fxn(sdp->sd_vfs, 0); 1382 quotad_error(sdp, msg, error); 1383 *timeo = gfs2_tune_get_i(&sdp->sd_tune, new_timeo) * HZ; 1384 } else { 1385 *timeo -= t; 1386 } 1387 } 1388 1389 static void quotad_check_trunc_list(struct gfs2_sbd *sdp) 1390 { 1391 struct gfs2_inode *ip; 1392 1393 while(1) { 1394 ip = NULL; 1395 spin_lock(&sdp->sd_trunc_lock); 1396 if (!list_empty(&sdp->sd_trunc_list)) { 1397 ip = list_entry(sdp->sd_trunc_list.next, 1398 struct gfs2_inode, i_trunc_list); 1399 list_del_init(&ip->i_trunc_list); 1400 } 1401 spin_unlock(&sdp->sd_trunc_lock); 1402 if (ip == NULL) 1403 return; 1404 gfs2_glock_finish_truncate(ip); 1405 } 1406 } 1407 1408 void gfs2_wake_up_statfs(struct gfs2_sbd *sdp) { 1409 if (!sdp->sd_statfs_force_sync) { 1410 sdp->sd_statfs_force_sync = 1; 1411 wake_up(&sdp->sd_quota_wait); 1412 } 1413 } 1414 1415 1416 /** 1417 * gfs2_quotad - Write cached quota changes into the quota file 1418 * @sdp: Pointer to GFS2 superblock 1419 * 1420 */ 1421 1422 int gfs2_quotad(void *data) 1423 { 1424 struct gfs2_sbd *sdp = data; 1425 struct gfs2_tune *tune = &sdp->sd_tune; 1426 unsigned long statfs_timeo = 0; 1427 unsigned long quotad_timeo = 0; 1428 unsigned long t = 0; 1429 DEFINE_WAIT(wait); 1430 int empty; 1431 1432 while (!kthread_should_stop()) { 1433 1434 /* Update the master statfs file */ 1435 if (sdp->sd_statfs_force_sync) { 1436 int error = gfs2_statfs_sync(sdp->sd_vfs, 0); 1437 quotad_error(sdp, "statfs", error); 1438 statfs_timeo = gfs2_tune_get(sdp, gt_statfs_quantum) * HZ; 1439 } 1440 else 1441 quotad_check_timeo(sdp, "statfs", gfs2_statfs_sync, t, 1442 &statfs_timeo, 1443 &tune->gt_statfs_quantum); 1444 1445 /* Update quota file */ 1446 quotad_check_timeo(sdp, "sync", gfs2_quota_sync, t, 1447 "ad_timeo, &tune->gt_quota_quantum); 1448 1449 /* Check for & recover partially truncated inodes */ 1450 quotad_check_trunc_list(sdp); 1451 1452 try_to_freeze(); 1453 1454 t = min(quotad_timeo, statfs_timeo); 1455 1456 prepare_to_wait(&sdp->sd_quota_wait, &wait, TASK_INTERRUPTIBLE); 1457 spin_lock(&sdp->sd_trunc_lock); 1458 empty = list_empty(&sdp->sd_trunc_list); 1459 spin_unlock(&sdp->sd_trunc_lock); 1460 if (empty && !sdp->sd_statfs_force_sync) 1461 t -= schedule_timeout(t); 1462 else 1463 t = 0; 1464 finish_wait(&sdp->sd_quota_wait, &wait); 1465 } 1466 1467 return 0; 1468 } 1469 1470 static int gfs2_quota_get_xstate(struct super_block *sb, 1471 struct fs_quota_stat *fqs) 1472 { 1473 struct gfs2_sbd *sdp = sb->s_fs_info; 1474 1475 memset(fqs, 0, sizeof(struct fs_quota_stat)); 1476 fqs->qs_version = FS_QSTAT_VERSION; 1477 1478 switch (sdp->sd_args.ar_quota) { 1479 case GFS2_QUOTA_ON: 1480 fqs->qs_flags |= (FS_QUOTA_UDQ_ENFD | FS_QUOTA_GDQ_ENFD); 1481 /*FALLTHRU*/ 1482 case GFS2_QUOTA_ACCOUNT: 1483 fqs->qs_flags |= (FS_QUOTA_UDQ_ACCT | FS_QUOTA_GDQ_ACCT); 1484 break; 1485 case GFS2_QUOTA_OFF: 1486 break; 1487 } 1488 1489 if (sdp->sd_quota_inode) { 1490 fqs->qs_uquota.qfs_ino = GFS2_I(sdp->sd_quota_inode)->i_no_addr; 1491 fqs->qs_uquota.qfs_nblks = sdp->sd_quota_inode->i_blocks; 1492 } 1493 fqs->qs_uquota.qfs_nextents = 1; /* unsupported */ 1494 fqs->qs_gquota = fqs->qs_uquota; /* its the same inode in both cases */ 1495 fqs->qs_incoredqs = list_lru_count(&gfs2_qd_lru); 1496 return 0; 1497 } 1498 1499 static int gfs2_get_dqblk(struct super_block *sb, struct kqid qid, 1500 struct fs_disk_quota *fdq) 1501 { 1502 struct gfs2_sbd *sdp = sb->s_fs_info; 1503 struct gfs2_quota_lvb *qlvb; 1504 struct gfs2_quota_data *qd; 1505 struct gfs2_holder q_gh; 1506 int error; 1507 1508 memset(fdq, 0, sizeof(struct fs_disk_quota)); 1509 1510 if (sdp->sd_args.ar_quota == GFS2_QUOTA_OFF) 1511 return -ESRCH; /* Crazy XFS error code */ 1512 1513 if ((qid.type != USRQUOTA) && 1514 (qid.type != GRPQUOTA)) 1515 return -EINVAL; 1516 1517 error = qd_get(sdp, qid, &qd); 1518 if (error) 1519 return error; 1520 error = do_glock(qd, FORCE, &q_gh); 1521 if (error) 1522 goto out; 1523 1524 qlvb = (struct gfs2_quota_lvb *)qd->qd_gl->gl_lksb.sb_lvbptr; 1525 fdq->d_version = FS_DQUOT_VERSION; 1526 fdq->d_flags = (qid.type == USRQUOTA) ? FS_USER_QUOTA : FS_GROUP_QUOTA; 1527 fdq->d_id = from_kqid_munged(current_user_ns(), qid); 1528 fdq->d_blk_hardlimit = be64_to_cpu(qlvb->qb_limit) << sdp->sd_fsb2bb_shift; 1529 fdq->d_blk_softlimit = be64_to_cpu(qlvb->qb_warn) << sdp->sd_fsb2bb_shift; 1530 fdq->d_bcount = be64_to_cpu(qlvb->qb_value) << sdp->sd_fsb2bb_shift; 1531 1532 gfs2_glock_dq_uninit(&q_gh); 1533 out: 1534 qd_put(qd); 1535 return error; 1536 } 1537 1538 /* GFS2 only supports a subset of the XFS fields */ 1539 #define GFS2_FIELDMASK (FS_DQ_BSOFT|FS_DQ_BHARD|FS_DQ_BCOUNT) 1540 1541 static int gfs2_set_dqblk(struct super_block *sb, struct kqid qid, 1542 struct fs_disk_quota *fdq) 1543 { 1544 struct gfs2_sbd *sdp = sb->s_fs_info; 1545 struct gfs2_inode *ip = GFS2_I(sdp->sd_quota_inode); 1546 struct gfs2_quota_data *qd; 1547 struct gfs2_holder q_gh, i_gh; 1548 unsigned int data_blocks, ind_blocks; 1549 unsigned int blocks = 0; 1550 int alloc_required; 1551 loff_t offset; 1552 int error; 1553 1554 if (sdp->sd_args.ar_quota == GFS2_QUOTA_OFF) 1555 return -ESRCH; /* Crazy XFS error code */ 1556 1557 if ((qid.type != USRQUOTA) && 1558 (qid.type != GRPQUOTA)) 1559 return -EINVAL; 1560 1561 if (fdq->d_fieldmask & ~GFS2_FIELDMASK) 1562 return -EINVAL; 1563 1564 error = qd_get(sdp, qid, &qd); 1565 if (error) 1566 return error; 1567 1568 error = gfs2_rs_alloc(ip); 1569 if (error) 1570 goto out_put; 1571 1572 mutex_lock(&ip->i_inode.i_mutex); 1573 error = gfs2_glock_nq_init(qd->qd_gl, LM_ST_EXCLUSIVE, 0, &q_gh); 1574 if (error) 1575 goto out_unlockput; 1576 error = gfs2_glock_nq_init(ip->i_gl, LM_ST_EXCLUSIVE, 0, &i_gh); 1577 if (error) 1578 goto out_q; 1579 1580 /* Check for existing entry, if none then alloc new blocks */ 1581 error = update_qd(sdp, qd); 1582 if (error) 1583 goto out_i; 1584 1585 /* If nothing has changed, this is a no-op */ 1586 if ((fdq->d_fieldmask & FS_DQ_BSOFT) && 1587 ((fdq->d_blk_softlimit >> sdp->sd_fsb2bb_shift) == be64_to_cpu(qd->qd_qb.qb_warn))) 1588 fdq->d_fieldmask ^= FS_DQ_BSOFT; 1589 1590 if ((fdq->d_fieldmask & FS_DQ_BHARD) && 1591 ((fdq->d_blk_hardlimit >> sdp->sd_fsb2bb_shift) == be64_to_cpu(qd->qd_qb.qb_limit))) 1592 fdq->d_fieldmask ^= FS_DQ_BHARD; 1593 1594 if ((fdq->d_fieldmask & FS_DQ_BCOUNT) && 1595 ((fdq->d_bcount >> sdp->sd_fsb2bb_shift) == be64_to_cpu(qd->qd_qb.qb_value))) 1596 fdq->d_fieldmask ^= FS_DQ_BCOUNT; 1597 1598 if (fdq->d_fieldmask == 0) 1599 goto out_i; 1600 1601 offset = qd2offset(qd); 1602 alloc_required = gfs2_write_alloc_required(ip, offset, sizeof(struct gfs2_quota)); 1603 if (gfs2_is_stuffed(ip)) 1604 alloc_required = 1; 1605 if (alloc_required) { 1606 struct gfs2_alloc_parms ap = { .aflags = 0, }; 1607 gfs2_write_calc_reserv(ip, sizeof(struct gfs2_quota), 1608 &data_blocks, &ind_blocks); 1609 blocks = 1 + data_blocks + ind_blocks; 1610 ap.target = blocks; 1611 error = gfs2_inplace_reserve(ip, &ap); 1612 if (error) 1613 goto out_i; 1614 blocks += gfs2_rg_blocks(ip, blocks); 1615 } 1616 1617 /* Some quotas span block boundaries and can update two blocks, 1618 adding an extra block to the transaction to handle such quotas */ 1619 error = gfs2_trans_begin(sdp, blocks + RES_DINODE + 2, 0); 1620 if (error) 1621 goto out_release; 1622 1623 /* Apply changes */ 1624 error = gfs2_adjust_quota(ip, offset, 0, qd, fdq); 1625 1626 gfs2_trans_end(sdp); 1627 out_release: 1628 if (alloc_required) 1629 gfs2_inplace_release(ip); 1630 out_i: 1631 gfs2_glock_dq_uninit(&i_gh); 1632 out_q: 1633 gfs2_glock_dq_uninit(&q_gh); 1634 out_unlockput: 1635 mutex_unlock(&ip->i_inode.i_mutex); 1636 out_put: 1637 qd_put(qd); 1638 return error; 1639 } 1640 1641 const struct quotactl_ops gfs2_quotactl_ops = { 1642 .quota_sync = gfs2_quota_sync, 1643 .get_xstate = gfs2_quota_get_xstate, 1644 .get_dqblk = gfs2_get_dqblk, 1645 .set_dqblk = gfs2_set_dqblk, 1646 }; 1647 1648 void __init gfs2_quota_hash_init(void) 1649 { 1650 unsigned i; 1651 1652 for(i = 0; i < GFS2_QD_HASH_SIZE; i++) 1653 INIT_HLIST_BL_HEAD(&qd_hash_table[i]); 1654 } 1655